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Roman Catechism
Source of the Efficacy of Satisfactory Works
Of the great efficacy of penance we may form some idea, if we reflect that it arises entirely from the merits of the Passion of Christ our Lord. It is His Passion that imparts to our good actions two greatest advantages: the first, that we may merit the rewards of eternal glory, so that a cup of cold water given in His name shall not be without its reward; the second, that we may be able to satisfy for our sins.
Nor does this lessen the most perfect and superabundant satisfaction of Christ our Lord, but, on the contrary, renders it still more conspicuous and illustrious. For the grace of Christ is seen to abound more, inasmuch as it communicates to us not only what He merited and paid of Himself alone, but also what, as Head, He merited and paid in His members, that is, in holy and just men. Hence it can be seen how such great weight and dignity belong to the good actions of the pious. For Christ our Lord continually infuses His grace into the devout soul united to Him by charity, as the head to the members, or as the vine through the branches. This grace always precedes, accompanies and follows our good works, and without it we can have no merit, nor can we at all satisfy God.
Hence it is that nothing seems wanting to the just. Through their works done by the power of God, they are able, on the one hand, to satisfy God’s law, as far as their human and mortal condition will allow; and, on the other hand, they can merit eternal life, to the fruition of which they will be admitted if they die in the state of God’s grace. Well known are the words of the Saviour: He that shall drink of the water that I will give him shall not thirst for ever; but the water that I will give him shall become in him a fountain of water, springing up into life everlasting.